discribe three of the trials and tribulations that native americans endure during the settlement of the west

http://www.pbs.org/wgbh/americanexperience/features/interview/tcrr-interview/

http://en.wikipedia.org/wiki/Native_Americans_in_the_United_States

http://www.pinkmonkey.com/studyguides/subjects/am_his/chap7/a0707301.asp

can one trial be the battle of bighorn, battle of Palo Duro Canyon

I'd use different examples than battles.

so what does trials and tribulation mean then

troubles and events that cause suffering

http://www.vocabulary.com/dictionary/tribulation

oh so 1) would be how they took their territory. 2) how they killed many native americans and 3)how they made them adapt to the white settlers culture,

Yes. Don't forget the forced move, the Trail of Tears. What about the buffalo?

Go back and read the articles I posted for you.